don't go for high reps either. your diet dictates whether you can really grow much muscle, but if you don't train the chest to want to build muscle, then you won't put on much there.
so, keep it to 6-8 reps on the chest, don't worry about upping poundage unless it gets too light.
also you could de-prioritize your chest. only do one exercise, and put it after your shoulder and tricep moves...that way shoulders are fresh for that specific exercise, adn get a little hit on when chest pressing. This may require you to lower teh poundage by 5-10% since you won't as energetic.